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采用苯乙烯-[乙烯-(乙烯-丙烯)]-苯乙烯嵌段共聚物(SEEPS),通过熔融共混技术对回收聚对苯二甲酸乙二醇酯(r-PET)进行了增韧改性,采用动态流变分析和DMA等手段研究了SEEPS用量对r-PET/SEEPS共混物流变行为和相容性的影响。结果表明:r-PET与SEEPS共混体系的相容性较差;随着SEEPS用量增加,r-PET/SEEPS共混物的复数黏度增加,表现出明显的剪切变稀行为,r-PET和SEEPS分子链间存在相互缠结作用,共混物的内耗峰减小,弹性模量增加;力学性能分析结果表明:含20%SEEPS的r-PET/SEEPS共混物缺口冲击强度比纯r-PET提高了107.04%,柔韧性明显增强,弯曲强度有所下降。
Recycled polyethylene terephthalate (r-PET) was toughened by melt blending technology using styrene- [ethylene- (ethylene-propylene)] - styrene block copolymer The rheological behavior and compatibility of r-PET / SEEPS blends were studied by means of dynamic rheological analysis and DMA. The results showed that the compatibility of r-PET with SEEPS blends was poor. The complex viscosity of r-PET / SEEPS blends increased with the increase of SEEPS dosage, showing obvious shear thinning behavior. The r-PET And the intertwined effect of the SEEPS molecular chains, the internal friction peak of the blend decreased, the elastic modulus increased; the mechanical properties of the results show that: the impact strength of the r-PET / SEEPS blends containing 20% SEEPS than the pure r -PET increased 107.04%, significantly increased flexibility, bending strength decreased.